DOI: 10.3724/SP.J.1249.2018.04353

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:4 PP.353-361

Determination of pore-throat size distribution of tight reservoirs based on nitrogen adsorption and mercury injection data: an example from Fuyu oil layer in Daan oilfield of Songliao basin

In order to realize the analysis of pore structure characteristics of tight sandstone reservoir, by taking the sample of Fuyu tight sandstone reservoir in Daan oilfield of Songliao basin, the results of pore-throat distributions observed by nitrogen adsorption and mercury injection method are integrated by using the mathematical method of prior-probability ratio. The characteristics of pore-throat distribution of tight sandstone reservoir are obtained, which lays a foundation for the comprehensive study on the tight reservoirs. The results show that the pore-throat distributions observed by the method of nitrogen adsorption and the method of mercury injection can be effectively integrated by the method of prior-probability ratio; the nitrogen adsorption method can only measure the pore-throat smaller than 63 nm in diameter, and the method of mercury injection can only measure the pore-throat larger than 6.3 nm in diameter. The pore-throat diameter distribution of S87 sample is mainly in range of 25 nm and 400 nm, and that of S105 sample is mainly in range of 10 nm and 400 nm. In tight sandstone reservoirs, as the reservoir porosity is constant, the greater the permeability of reservoir, the higher the content of larger pore-throats.

Key words:reservoir evaluation,nitrogen adsorption method,mercury injection method,prior probability,tight reservoir,effective integration,pore-throat size distribution

ReleaseDate:2018-07-26 10:51:02

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